Abstract
The following compounds have been detected in the sterol fraction from the mussel (mytilus edulis) after irradiation with ultra‐violet light: Vitamin‐D2 and ‐D3 and a compound closely related to ‐D2 and having a vitamin‐D structure, but which is practically devoid of anti‐rachitic action. A mixture of this compound with vitamin‐D2 has been isolated in a crystalline state (‐Dx).

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